Starbucks does not monitor wifi traffic at it's retail locations. Your local Starbucks uses the Motorola NVG510 that AT&T gave them when they opened up for business. The key is printed on the side of the router. 192.168.1.254 gets you the status screen. And no, those working at the Starbucks don't know how to change the router's IP address.

Yeah, I've had the FBI tell me I was guilty of robbing a bank once. Look, this is just their S.O.P. They point fingers and wait for someone else to spill the beans. Kind of like when someone in the room farts and the accusations start to fly.